A common mechanism underlies the dark fraction formation and fluorescence blinking of quantum dots
CdSe quantum dots (QDs) are known to exhibit both power-law blinking dynamics and a
dark fraction. A complete description of the mechanistic origins of these properties is still
lacking. We show that a change in the pH of the QD environment systematically changes
both the dark fraction and the blinking statistics. As pH is lowered, shorter “on” times and
longer “off” times, as well as an increase in the permanent dark fraction, are observed. The
increase in the dark fraction is preceded by a decrease in the emission intensity of a single …
dark fraction. A complete description of the mechanistic origins of these properties is still
lacking. We show that a change in the pH of the QD environment systematically changes
both the dark fraction and the blinking statistics. As pH is lowered, shorter “on” times and
longer “off” times, as well as an increase in the permanent dark fraction, are observed. The
increase in the dark fraction is preceded by a decrease in the emission intensity of a single …
A Common Mechanism Underlies the Dark Fraction Formation and Fluorescence Blinking of Quantum Dots
P Grütter - 2009 - escholarship.mcgill.ca
CdSe quantum dots (QDs) are known to exhibit both power-law blinking dynamics and a
dark fraction. A complete description of the mechanistic origins of these properties is still
lacking. We show that a change in the pH of the QD environment systematically changes
both the dark fraction and the blinking statistics. As pH is lowered, shorter “on” times and
longer “off” times, as well as an increase in the permanent dark fraction, are observed. The
increase in the dark fraction is preceded by a decrease in the emission intensity of a single …
dark fraction. A complete description of the mechanistic origins of these properties is still
lacking. We show that a change in the pH of the QD environment systematically changes
both the dark fraction and the blinking statistics. As pH is lowered, shorter “on” times and
longer “off” times, as well as an increase in the permanent dark fraction, are observed. The
increase in the dark fraction is preceded by a decrease in the emission intensity of a single …
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